Birmingham Bears
Carlos Brathwaite (West Indies), Paul Stirling (Ireland - available for first 12 games and Finals Day if required, due to international commitments), Nathan McAndrew (Australia)
Derbyshire Falcons
Shan Masood (Pakistan), Suranga Lakmal (Sri Lanka), Dustin Melton (Zimbabwe).
Durham
David Bedingham, Ashton Turner (both Australia)
Essex Eagles
Simon Harmer (South Africa), Daniel Sams (Australia)
Glamorgan
Colin Ingram (South Africa), Michael Neser, Marnus Labushagne (both Australia)
Gloucestershire
Zafar Gohar (Pakistan), Marcus Harris (Australia), Naseem Shah (Pakistan - available until the end of the group stage), Glenn Phillips (New Zealand)
Hampshire Hawks
Ben McDermott, Nathan Ellis (both Australia), Kyle Abbott (South Africa)
Kent Spitfires
Qais Ahmad (Afghanistan), George Linde (South Africa)
Lancashire Lightning
Dane Vilas (South Africa), Tim David (Australia)
Leicestershire Foxes
Naveen-ul-Haq, Rahmanullah Gurbaz (both Afghanistan)
Middlesex
Mujeeb Ur Rahman (Afghanistan), Jason Behrendorff, Chris Green (both Australia)
Northamptonshire Steelbacks
Jimmy Neesham (New Zealand), Chris Lynn (Australia)
Notts Outlaws
Dane Paterson (South Africa), James Pattinson, Dan Christian (both Australia)
Somerset
Peter Siddle (Australia), Marchant de Lange, Rilee Rossouw (both South Africa)
Surrey
Sunil Narine, Kieron Pollard (both West Indies)
Sussex Sharks
Rashid Khan (Afghanistan), Josh Philippe (Australia), Mohammad Rizwan (Pakistan - until mid -June)
Worcestershire Rapids
Colin Munro (New Zealand), Dwayne Bravo (West Indies)
Yorkshire Vikings
Shadab Khan (Pakistan), Haris Rauf (Pakistan - avalable for first five games), Finn Allen (New Zealand - replaces Rauf)